package net.minecraft.entity;

import net.minecraft.util.MathHelper;

public class EntityBodyHelper {
	/** Instance of EntityLiving. */
	private EntityLivingBase theLiving;

	/**
	 * Used to progressively ajust the rotation of the body to the rotation of the
	 * head
	 */
	private int rotationTickCounter;
	private float prevRenderYawHead;

	public EntityBodyHelper(EntityLivingBase p_i1611_1_) {
		this.theLiving = p_i1611_1_;
	}

	/**
	 * Update the Head and Body rendenring angles
	 */
	public void updateRenderAngles() {
		double d0 = this.theLiving.posX - this.theLiving.prevPosX;
		double d1 = this.theLiving.posZ - this.theLiving.prevPosZ;

		if (d0 * d0 + d1 * d1 > 2.500000277905201E-7D) {
			this.theLiving.renderYawOffset = this.theLiving.rotationYaw;
			this.theLiving.rotationYawHead = this.computeAngleWithBound(this.theLiving.renderYawOffset,
					this.theLiving.rotationYawHead, 75.0F);
			this.prevRenderYawHead = this.theLiving.rotationYawHead;
			this.rotationTickCounter = 0;
		} else {
			float f = 75.0F;

			if (Math.abs(this.theLiving.rotationYawHead - this.prevRenderYawHead) > 15.0F) {
				this.rotationTickCounter = 0;
				this.prevRenderYawHead = this.theLiving.rotationYawHead;
			} else {
				++this.rotationTickCounter;
				int i = 10;

				if (this.rotationTickCounter > 10) {
					f = Math.max(1.0F - (float) (this.rotationTickCounter - 10) / 10.0F, 0.0F) * 75.0F;
				}
			}

			this.theLiving.renderYawOffset = this.computeAngleWithBound(this.theLiving.rotationYawHead,
					this.theLiving.renderYawOffset, f);
		}
	}

	/**
	 * Return the new angle2 such that the difference between angle1 and angle2 is
	 * lower than angleMax. Args : angle1, angle2, angleMax
	 */
	private float computeAngleWithBound(float p_75665_1_, float p_75665_2_, float p_75665_3_) {
		float f = MathHelper.wrapAngleTo180_float(p_75665_1_ - p_75665_2_);

		if (f < -p_75665_3_) {
			f = -p_75665_3_;
		}

		if (f >= p_75665_3_) {
			f = p_75665_3_;
		}

		return p_75665_1_ - f;
	}
}
